hybrid pagination

internal/tender/repository.go

@@ -40,8 +40,6 @@ func collectionName() string {
 	return "tenders"
 }
 
-// deepOffsetSkipCountThreshold skips CountDocuments when offset pagination goes this deep.
-const deepOffsetSkipCountThreshold = 1000
 
 // SearchPageResult is the paginated outcome of a tender search/list query.
 type SearchPageResult struct {
@@ -49,6 +47,7 @@ type SearchPageResult struct {
 	TotalCount int64 // -1 when count was skipped
 	NextCursor string
 	HasMore    bool
+	PageOffset int
 }
 
 // tenderSearchListProjection excludes large fields not needed for list/search API payloads.
@@ -370,21 +369,20 @@ func (r *tenderRepository) Search(ctx context.Context, form *SearchForm, paginat
 		sortOrder = pagination.SortOrder
 	}
 
-	skipCount := pagination.Cursor != "" || pagination.Offset >= deepOffsetSkipCountThreshold
-
-	paginationBuilder := orm.NewPaginationBuilder().
-		Limit(pagination.Limit).
-		SortBy(sort, sortOrder).
-		Projection(tenderSearchListProjection()).
-		SkipCount(skipCount)
-
-	if pagination.Cursor != "" {
-		paginationBuilder.Cursor(pagination.Cursor)
-	} else {
-		paginationBuilder.Skip(pagination.Offset)
+	mongoPagination, err := orm.BuildListPagination(
+		pagination.Limit,
+		pagination.Offset,
+		pagination.Cursor,
+		sort,
+		sortOrder,
+		filter,
+		orm.ListPaginationOptions{Projection: tenderSearchListProjection()},
+	)
+	if err != nil {
+		return nil, err
 	}
 
-	result, err := r.ormRepo.FindAll(ctx, filter, paginationBuilder.Build())
+	result, err := r.ormRepo.FindAll(ctx, filter, mongoPagination)
 	if err != nil {
 		r.logger.Error("Failed to search tenders", map[string]interface{}{
 			"error": err.Error(),
@@ -397,6 +395,7 @@ func (r *tenderRepository) Search(ctx context.Context, form *SearchForm, paginat
 		TotalCount: result.TotalCount,
 		NextCursor: result.NextCursor,
 		HasMore:    result.HasMore,
+		PageOffset: result.PageOffset,
 	}, nil
 }